craywm Posted October 8, 2015 Report Share Posted October 8, 2015 Hello all, So, quick back ground. Earlier this year I burnt 2 valves. First one went in January, second one went in May. Decided to rebuild my top end. While I was down there, I wiggled my my turbo shaft and decided to rebuild that too. Turbo was balanced by a shop. All parts are original Mitsubishi parts. Just finished putting it back together and started her up on Sunday. It ran great all day (I decided to take a 100 mile drive the day I started it up). The drive was highway speed, 70 miles of 65-70 mph on cruise with no boost. Around the 70 mile mark I decided to pull off and check out a small town. 2 miles off the exit, I noticed a loud whistling sound that fluctuated with rpm. I thought maybe I had a vacuum tube lose or something so I didn't think anything of it. I've driven it another 30 miles now (just to work and back) and still have the same sound. I have NO loss in power. After the turbo rebuild and adjusting my throttle/wastegate, my power is great! checked all my fluids, and they were all good. engine isnt over heating. The sound is ONLY present in drive with the gear selection in the "D" position. I tested park and neutral with no luck. So I figure all that info rules out the turbo, and since its only making the sound in drive, that would rule out the engine bearings. I started thinking this could be a transmission bearing but I dont know what that sounds like.. Also, I have not changed my transmission fluid (since I bought the car, who knows when it was last changed). Also, I removed my prop shaft so I'm running FWD only. I thought also since my transmission is strong, could it be that my transfer case and bevel gear sprung a seal and is dry now? I figures that could produce an rpm related whistle as well, plus the volume level in the cabin would point to it being closer to the cabin area than the transmission. I have not been able to identify where the whistle is originating from since it only happens in drive and I cant exactly sit under the hood at 30 mph. So my questions are: 1) could this be the transmission? What in the transmission would make this noise? 2) could a dry transfer/bevel gear cause this type of noise? I've taken a few low speed videos of the sound. I know what normal turbo operation sounds like. All i've ever driven my whole life has been Volvo 5-cylinder turbos. I'm fairly certain this isn't a turbo issue. Here's the youtube link to the video: <iframe width="420" height="315" src="https://www.youtube.com/embed/XPrxB91WZh0"frameborder="0" allowfullscreen></iframe> Thanks for all the help in advance! CrayHere is one more you tube video showing neutral and drive. Took it on an empty back road just so everyone knows. Thanks all! <iframe width="420" height="315" src="https://www.youtube.com/embed/D8reJNFo7ak"frameborder="0" allowfullscreen></iframe> Link to comment Share on other sites More sharing options...
Big Will Posted October 8, 2015 Report Share Posted October 8, 2015 That doesn't sound like the kind of whine that an angle gear makes when it has damage...at least that's distinctly different from any that I've heard. To me, it sounds like the alternator or a tensioner/pulley making noise but obviously internet diagnosis is mostly just conjecture. Link to comment Share on other sites More sharing options...
craywm Posted October 8, 2015 Author Report Share Posted October 8, 2015 Thanks for the reply Big Will. I realized I forgot to mention when I did the rebuild I replaced timing belt, idler pulley, water pump, and the mechanical tensioner. Also, I thought since it was only making the whine in Drive, that it would be independent of the timing belt or serpentine belt. I did not touch anything related to my accessories belt when I did the rebuild. I could be wrong though. I would be relieved if it was an alternator noise.. Thanks Link to comment Share on other sites More sharing options...
flyfishing31568908306 Posted October 8, 2015 Report Share Posted October 8, 2015 i'm calling power steering pump Link to comment Share on other sites More sharing options...
craywm Posted October 8, 2015 Author Report Share Posted October 8, 2015 flyfishing3, Could it be my power steering pump if it only occurs in drive? Someone told me that when the crankshaft is transmitting power, it can move slightly. Could the noise be from the power steering pump pulley being slightly misaligned with the crankshaft pulley? Or do you think its a bearing? I did check the fluid and its good. But I have noticed some hard steering changes recently since I started driving it again. This morning it did almost sound like the noise was coming from the passenger side. But I still cant locate it. Link to comment Share on other sites More sharing options...
Big Will Posted October 9, 2015 Report Share Posted October 9, 2015 Again, this is conjecture but I'm with Mike on this one at least in that it's probably something that runs off the accessory belt. You're right that an accessory belt noise should be heard when in park and revving the engine but it's possible that the force on the engine when accelerating is moving things just enough to change/create the pitch you hear. Obviously it would be great if you could hear the noise when revving the engine with the hood open, standing over it but that's not something that can be done while the car is driving around. Are you sure the noise isn't present in the situation I described above (revving engine with the hood open in Park)? Perhaps you can have a friend do so while you carefully check...you may hear something that gives you a clue. Link to comment Share on other sites More sharing options...
1clean00 Posted October 9, 2015 Report Share Posted October 9, 2015 I started thinking this could be a transmission bearing but I dont know what that sounds like.. Also, I have not changed my transmission fluid (since I bought the car, who knows when it was last changed). That sound is similar to what i heard when some trash got into the torque converter. Did this mainly when cold for the first 3-5 minutes of driving and then went away once hot. I eventually lost lockup engagment/disengagement, and all forward gears. I'd flush the trans as a precautionary measure. I'd hate for it to take a dump if otherwise it's a strong running car. Link to comment Share on other sites More sharing options...
craywm Posted October 9, 2015 Author Report Share Posted October 9, 2015 I did have my wife rev it in park while i used my tubeoscope to listen around. I couldn't identify anything. I was planning on flushing my trans and replacing my transfer case oil, since who knows when that was done last. Another test I was going to run was remove the accessory belt and drive it (that will be very difficult without steering, but I've done it before). I am not flushing my trany, but will just do 3-5 changes, one every 1000 miles. I can take a video with the car in park revving, but I know it does not make the noise when in park or neutral and I'm not moving. I had my wife rev it when i was in the garage, so I should have been able to hear it. Especially since its that clear in the cabin at 35 mph. Link to comment Share on other sites More sharing options...
1clean00 Posted October 9, 2015 Report Share Posted October 9, 2015 I did have my wife rev it in park while i used my tubeoscope to listen around. I couldn't identify anything. I was planning on flushing my trans and replacing my transfer case oil, since who knows when that was done last. Another test I was going to run was remove the accessory belt and drive it (that will be very difficult without steering, but I've done it before). I am not flushing my trany, but will just do 3-5 changes, one every 1000 miles. I can take a video with the car in park revving, but I know it does not make the noise when in park or neutral and I'm not moving. I had my wife rev it when i was in the garage, so I should have been able to hear it. Especially since its that clear in the cabin at 35 mph. Yeah, like i said, it wouldn't load the converter in Park or neutral. You hear it in drive and only drive because the torque converter is sending power through the trans and drivetrain. And i agree, a "powerflush" wouldn't be advised, but you can drain and fill until the system has been changed completely. Link to comment Share on other sites More sharing options...
craywm Posted October 9, 2015 Author Report Share Posted October 9, 2015 I had talked to a master technician recently who told me that the torque converter is always turning. But, if that energy isn't transferred to the wheels. That's why when you park on a hill and you put the car in drive, it can sound louder sometimes because the pressure is released. I took it as a grain of salt since he was unfamiliar with the 98 v70 transmission. The torque converter should still be spinning, the clutches that control the gears are just disengaged. Did you only hear the noise in drive for the 3-5 minutes coming from your torque converter? or could you hear it in park and neutral too? Link to comment Share on other sites More sharing options...
1clean00 Posted October 9, 2015 Report Share Posted October 9, 2015 That's what i said, when the converter sees "load" not rotation. I had no noise in park or neutral. In drive it was most noticeable first thing in the morning pulling out of my driveway (slight incline), once i got out of the neighborhood it seemed to disappear. It was most noticeable in low rpm high load situations, down low from a start or slowly going up a hill. Once it was opened up it was fine, highway driving was normal. Link to comment Share on other sites More sharing options...
craywm Posted October 9, 2015 Author Report Share Posted October 9, 2015 Mines pretty constant all the time. I'll change the trans oil and angle gear oil tonight then. I hope I don't have anything lodged in there.. that would totally suck. I still get great power though, at least enough to accidentally spin my tires pulling out of the neighborhood (with TRACS off). Thanks for the tip. Did you end up replacing your transmission? Wondering if there's hope for mine. Link to comment Share on other sites More sharing options...
1clean00 Posted October 9, 2015 Report Share Posted October 9, 2015 I did replace mine eventually. Had about two weeks where i noticed the noise, and then one night merging onto the highway it had a really rough shift and then went into limp mode. Luckily the next morning it went back to normal and drove fine all the way to my local indy. Once he pulled the codes they were for torque converter function and tcm communciation. A reman trans and new torque converter went in, and it's been like a new car for the last 5K miles. Happened to mine around 180K. On my old 99R, it only ever had reverse problems. Had to feather the throttle to get it moving before i could backup. All forward gears were fine. Hopefully a good flush fixes it if you haven't had one done. Link to comment Share on other sites More sharing options...
craywm Posted October 9, 2015 Author Report Share Posted October 9, 2015 Thanks for the heads up. I'll be changing those fluids tonight. I have 198K on the odo right now (which is why I did the engine rebuild). I couldn't rest knowing it almost made it to 200K, but wouldn't over a burnt valve. Now if only I didn't take it through that soft touch foam car wash... messed up the good paint job.. I just realized how ignorant I've been. While on lunch break, I drove the car again and popped it into Neutral. I could slightly hear the noise again, probably because its getting worse. But I noticed when I pop the car into neutral and hold the throttle at the same position the RPMs skyrocket.. Obviously the turbo doesnt spin fast at all in park or neutral because the rpms climb too fast to produce enough pressure. With a load though, the throttle can open more and pressure is enough. I am now thinking it is a problem with the turbo, especially since I rebuilt it not 1 month ago.. Looks like ill be in the market for a new cassette. I'm going to use a mechanics stethoscope first though. maybe I can hear something in park or neutral, but engine noise is drowning it out. hope I havent torched my turbo too much yet if it is the problem. Link to comment Share on other sites More sharing options...
craywm Posted October 12, 2015 Author Report Share Posted October 12, 2015 I took my intake out again and found my intake tube had a notch taken out of it. I dont think it is effecting the sealing though. I thought at first that I may be able to hear the turbo operating (and unfiltered air was being sucked into the turbo) through the notch, but I don't think this is the case now. I can not hear the noise at high rpms in park and neutral. I will be tracking it down later this week. I'm thinking if I need a new CHRA, I will order it from Midwest turbo. Does anyone know if they are a reputable supplier? Not sure if I trust the Ebay CHRA replacements. Sucks that my rebuild was no good. In the future, I suggest to all to just order the new CHRA as its only $350 and you know its good. Link to comment Share on other sites More sharing options...
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